Portable lighting device



FIG. 1 is a perspective view of a portable lighting device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is another perspective view thereof; and,

FIG. 9 is the perspective view showing usage of a back splint thereon.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a portable lighting device, as shown and described. 